On Sat, 7 Oct 2006 12:49 pm, Joe Benner wrote:
> Hi Toby,
> I have one of the galvanometers that showed up at weird science (and
> also at
> House of Science) a couple years ago. I don't know if you've seen them.
> It's
> a DC motor with a 3 inch needle that pivots on the motor's shaft. The
> needle
> is for writing on thermal paper with. I just ran 5V through a 10K pot
> to the
> motor. I turn the knob on the pot and the needle jumps proportionately.
>> Basically the whole thing could be made to look (even act) like a
> seismograph pretty easily.
>> You could probably tape a ball point/felt tip pen filler tube thingy to
> the
> needle.
>> I think you could probably run it right off an analog input (maybe with
> a
> just transistor to amplify and/or some added resistance).
>> The assembly also has a paper feed roller for a tape about 2 in. wide -
> like
> a cash register tape.
>> It's yours if you want it.
>> I'm in Tacoma - there is a good chance someone in Seattle has one they
> might
> be willing to pass on to you too.
Probably a lot of folks on this list that have those around. I have two
you can have that are alreadsy in Seattle (Quee Anne).
pablos.